chore: remove deprecated features update docs

[Xerrion]

Description

This PR removes deprecated files and updates the documation.

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Refactor (non-breaking change that improves code quality)
• Documentation update
• Breaking change (fix or feature that would cause existing functionality to change)

Related Issues

None

Testing

• Luacheck passes (luacheck .)
• Tested in-game manually
• WoW version(s) tested on:

Screenshots

Checklist

• My code follows the project's code style (4-space indent, 120 char lines)
• I have tested my changes in-game
• Luacheck reports no warnings
• My commits follow conventional commit format